Tao te Ching: 69

The strategists say:
   "I dare not take the offensive but I take the defensive;
    I dare not advance an inch but I retreat a foot."
This means:
   To march without formation,
   To stretch one's arm without showing it,
   To confront enemies without seeming to meet them,
   To hold weapons without seeming to have them.
There is no greater disaster than to make light of the enemy.
Making light of the enemy will destroy my treasures.
Therefore when armies are mobilized and issues joined,
The man who is sorry over the fact will win.

If this sounds like The Art of War, then you're right. Sun Tzu's The Art of War can be considered to be the preeminent treatise on Taoism and warfare. Though the actual creation date of the Tao te Ching is questionable, it was in circulation in some fashion or another by the 5th century BC when Sun Tzu was alive and active. I urge you to read through Sun Tzu if you get an opportunity, though it is a longer work than the Tao te Ching and the tactics are dated in some respects. However, the underlying philosophy of making an enemy over extend and commit resources while conserving your own is naught but frugality and wu-wei.